Historic reef table placing Las Dos Hermanas at 14.3 m depth.

Huatulco destination guide noting Chachacual / Dos Hermanas canyons, manta rays, turtles, and boat-based access.

Huatulco diving overview with typical visibility and seasonal planning window.

Huatulco National Park management plan listing Dos Hermanas among coral communities and the park's access rules.

Local operator listing with parking, boat, guide, and facility support in Huatulco.

Huatulco dive guide with Dos Hermanas in Chachacual, canyon terrain, and local marine-life commentary.

Recent reef study describing Dos Hermanas as a reef community away from settlements and river mouths, with shallow transects at 3-6 m.