The Mexican border, at El Ceibo, in the Tabasco district of Mexico. El Ceibo (Mexico) and La Ceiba (Honduras) both refer to a family of large trees that were important to pre-Columbian cultures.
I was able to find coconut water without added sugar, which unless you're drinking straight from the coconut is basically impossible in Honduras. Everything has so much sugar added. Tenosique, in southeastern Tabasco, Mexico.