Santa María Tonameca is a town and municipality located on the southern coast of Oaxaca, Mexico, about 268 km from the capital city of Oaxaca. It is part of the Pochutla District in the east of the Costa Region. It is a very rural area, which is best known for the beach communities of Mazunte, San Agustinillo and La Ventanilla. The National Turtle Center, a research center and aquarium is located in Mazunte, along with conservation centers for butterflies and iguanas.