Lake Lancaster Abajo (Spanish: Laguna Lancaster Abajo), together with Lake Lancaster Arriba are part of two lakes in the Limón province of Costa Rica, collectively referred as the Lancaster Lakes.

[1] The Lancaster lakes are located in a private property next to Reventazón River, and 7.35 kilometers SW of the Reventazón Dam.

Lancaster Abajo is located at 100 m lower elevation and to the south of Lancaster Arriba.

[2] Lake Lancaster Abajo is of landslide origin, it possesses cool stream water inputs and is probably stratified through the year due to its relative depth.

[1] The Bonilla-Bonillita Lacustrine Wetland created in 1994 is composed by this lake and Lake Lancaster Arriba, Lake Bonilla and Lake Bonillita and their surrounding areas.