Unimog Expedition in Mexico 2003

Altar Dunes and El Gulfo, Sonora 

Trip Report:  December 3-7, 2003

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Experiencing the Altar Desert in Epicurean Style

Quick link to start of daily log and photos Day 0: 03-12-2003  Preparation in Yuma


Northwestern Sonora in Mexico is one of the largest remaining remote areas south of Canada.  This area is hard core desert, cruel in the summer and unforgiving of mistakes.  Four wheel drive clubs in the southwest have been making crossing of the Altar Dunes from either the Sonoita area or from San Luis del Colorado south of Yuma, AZ. for many years.  This area offers one of the last remaining true adventures within easy driving distance from the US.  I had done this trip in 2000 and 2002 with nearly the same crew, so we had good knowledge of the rigors that faced us.  Indeed, the Altar is a test of man and machine as well as your logistical planning skills.  To do something different, this trip, we planned to do a "gourmet-style" trip with exceptional food.  Several of us were accomplished camp cooks and Mike Nayoski was a professional cook at one point in his career.  The meals were planned well and we executed with flair.  This trip "raised the bar" for subsequent expeditions.

The Trip

The planned trip involved getting three Unimogs across the Mexican border, to San Luis del Colorado, Sonora then east along Mexican Highway 2 (the main highway) toward a small "truck stop" called Cesar's.  Cesar's is about 17 miles east of San Luis.  From a small dirt road just before Cesar's, we would head south for the high dunes.  The last trip, we traversed the entire Altar dune field.  The complete trip required 6 full days of hard-core travel to span over 400 miles of the dunes to get there and back.  However, on this trip, there was not sufficient time to do the full crossing.  So, we intended to cram the trip into a 4 day weekend.  This required careful planning and adherence to the schedule, and a reduced route of course.

The general plan was to pick a point off the map and then use the GPS to help us navigate to the waypoint.  This point was "the cross" and is shown in the GPS Waypoint table below.   From there, we were to head to El Gulfo in Sonora for supplies and then return via dunes to Cesar's and then to the boarder.

Once in El Gulfo, we would refuel, re-ice and buy camarones (shrimp), almejas (clams) and then head back to the dunes to find a camping spot.   See the satellite photos and maps lower on this page.

Like any trip to a foreign country, substantial pre-planning was required. To do such a trip required detailed knowledge of what conditions were expected as well as research on issues beyond just road conditions.  To prepare for this trip, we utilized experience gained from previous trips, tide charts, satellite photos, Mexican maps as well as other intelligence gathered from the local four wheel clubs.

To insure the success of a major expedition in a foreign country, it is absolutely essential that the proper team of vehicles and operators was assembled.  Of  key importance was vehicle reliability.  The size of the Altar dunes basically precludes the ability to tow a truck as dead weight.  While theoretically possible, the time required to complete the winching make recovery a practical impossibility.  Therefore, special attention was given to mechanical preparations prior to the trip.  And, in general, this paid off in a relatively trouble-free trip, some tire issues notwithstanding.

The Expedition Team

The away team for this expedition consisted 10 humans and 4 Unimogs:  The trucks, from left to right are Mark Mitchell's 1300L, Dan Johnson's 1550L, Bill Caid's 1300L and Kai Serrano's 416 double cab.

From Left to right are: , Dan Johnson (Indiana), Sean Philyaw (Georgia), Mike Bennett (Fresno, CA), Kai Serrano (San Diego), Matt Oliphant (Los Angeles), Mark Mitchell (San Diego), Alison Mitchell (San Diego), Mike Nayoski (San Diego), Bill Caid (San Diego).  Missing is Kathleen Jones (San Diego) who was the photographer.

 Below, is Kathleen Jones (San Diego), the resident self-appointed "trail dominatrix" who was missing from the above group shot as she was taking the photo.

All drivers had substantial experience in hard-core off-roading.  Most had completed the Rubicon and the hardest trails in Moab. Additionally, this group (all but Mark) had previously successfully done the high dunes of the Altar Desert in 2000 and 2002 and lived to tell about it.

The Equipment

The team had 4 full sized diesel Unimogs at it's disposal.  These vehicles were trail proven in a number of situations and were sufficiently powerful to make it through the very soft sand of the Altar Desert.  The equipment list:

 Geography of the Altar Desert

The area traversed is hard core desert; massive dunes that go for hundreds of miles.  This consists of alternating desert scrub (AKA "tundra") and big, razor-back dunes.  Some of the dunes are over 500 feet high and are composed of very soft sand the consistency of flour. Figure 1 shows a satellite photo of the general area.  Figure 2 below shows a zoom of the area of operations for this trip.  True north in these photos is about 30 degrees to the right of the left border.  See maps below for more accurate representation.

In Figure 1, San Diego bay is just below the top edge on the left.  The large lake is the Salton Sea.  Farmed areas are shown in red.  The road in Mexico that parallels the border can be seen.  Refer to the map below for reference.

Figure 1. Satellite Photo of Northern Baja and Northwest Sonora, Mexico.

In Figure 2, the large dunes are evident and can be seen as forming a set that roughly parallel the coast to the south.  The destination was El Gulfo de Santa Clara, and this is due east of the end of the largest "gray colored" island at the mouth of the Colorado River.

Figure 2.  Zoom Photograph of Area of Interest.

Trip Details

Maps of the Area

Two maps of the area are shown below in Figures 3 and 4.  Both are 1:250,000 topographic maps that were imaged with my digital camera and then cropped.  The main parallel lines are on 10 km increments.  Click on the map to get a full resolution view.  This is a 300kb file, so if you have a phone modem, this will take a while to load.

Figure 3.  Map of the Northern Portion of the Trip.

Figure 4. below shows the southern portion of the trip. Click on the map to get a full resolution view.  This is a 300kb file, so if you have a phone modem, this will take a while to load.  The parallel lines are 10km marks, so distances can be estimated from them.

Figure 4.  Map of the Southern Portion of the Trip.

On this trip, unlike the last time, I got a good estimate of mileage.  The total dune travel was 160 miles.   Total fuel usage for my 1300 was about 1 1/2 tank or about 55 gallons border to border.   Remarkably, and unlike previous trips, there was diesel in El Gulfo.  On the two previous trips, El Gulfo was out of diesel so I counted myself as lucky.

GPS Waypoints

For those readers that are technically minded, the table below contains the UTM coordinates of our camp sites.  The datum is NAD-27.  



East Coordinate

North Coordinate

Start at Cesar's 11S 0735656E 3586700N
Cross 11S 0735965E 3566681N
Camp Prime Rib 11S 0742300E 3566800N
Abandoned Jeep 11S 0740715E 3555561N
Camp Pork Loin 11R 0740005E 3531744N
Railroad track crossing 11R 0737200E 3518800N
El Gulfo 11R 0737200E 3508300N
Camp Surf and Turf 11R 0727000E 3540000N
End 11S 0735656E 3586700N

Day by Day Details and Photos

Day 0: 03-12-2003  Preparation in Yuma

Day 1: 04-12-2003  Crossing the Boarder to Camp Prime Rib

Day 2: 05-12-2003  Camp Prime Rib to Camp Pork Loin

Day 3: 06-12-2003  Camp Pork Loin to Camp Surf and Turf

Day 4: 07-12-2003  Camp Surf and Turf to USA


Conclusion and Traveler's Tips

The only checkpoint we encountered this trip was manned by the Mexican Army regulars looking for drugs and weapons.  They did want to look inside each vehicle.  While I cannot be sure, the fellow that went into my truck appeared to be the same guy as last year.  There were no problems encountered and all the personnel were amiable.  However, it is a law within Mexico that all vehicles (particularly those owned by foreigners) have liability insurance for their automobiles.  This means that you will have to have valid registration and plates for your vehicle.  Additionally, there are frequently tourist visas that must be obtained at the border.  I say frequently as it seems to change like the tides.  (It was not required this trip, nor the last but was required the one before). These not only require check in, but surrender of the documents upon departure from the country. These visa cost 170 pesos (about $20).  The good news is that they are not currently requiring them.

El Gulfo is a very small town; this is primarily a fishing village, but does cater to tourists, particularly Gringos around Thanksgiving, Christmas and New Years.  There is a Pemex station, and it probably has gas.  I say probably, because in Mexico, if the fuel truck does not show up for what ever reason, then there will be no gas or diesel.   There is a store and ice is available along with plenty of fresh fish, shrimp, clams and sometimes other shellfish. Water is in short supply, but can be purchased at the town OXXO store. There are several RV parks in town and several "hotels".  The quotes are used here since one of the selling features of the hotel is that it has indoor plumbing.

The locals make their living fishing, and good seafood is available at all times.  The best restaurant in town is the El Delfin and has excellent food although modest accommodations (they did, however, have hot water in the washroom). 

Miscellaneous Information

Although our crossing was made in December, it was warm to  hot during the day.  Typically, the evenings can be cold, so come prepared.  Rain is not out of the question.  Wind is highly likely, so protection from blowing sand, including goggles is a requirement.  And, should the wind come, having a fallback for cooking is a good idea.  High wind and blowing dust will put the chingas to any BBQ and will make a task as simple as boiling water a challenge.

Firearms are prohibited in Mexico.  Handguns, in particular, are frowned upon.  If you are caught with one in your possession, you will go directly to jail.  There is a very high likelihood that you will be unable to "buy" your way out of the situation no matter how much money you have with you, so this situation is better avoided.  While lack of a firearm in the wilderness will place you at somewhat of a disadvantage should trouble arise, the penalty for possession is so harsh that it is not worth the risk.  The proposed area of operations is known to be used by drug smugglers.  However, the open desert crossing is not the preferred route, so the chance of encountering anyone is nil.  But, the Mexican Army does patrol both the north end and the sea-side of the desert and if they stop you, they will most likely do a thorough search of the vehicle.  They pose no threat to honest Gringos that do not break the laws of their country. 

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