Isla Rasa is an island in the Gulf of California east of the Baja California Peninsula. The island is uninhabited and is part of the Mexicali Municipality. The 0.21 sq./mi island has three small ponds and has small shed located in the center of the island.
Isla Rasa has three species of reptiles: Phyllodactylus nocticolus (peninsular leaf-toed gecko), Sauromalus hispidus (spiny chuckwalla), and Uta stansburiana (common side-blotched lizard).
Isla Rasa is also the primary nesting site for about 95% of the world's Heermann's gulls and elegant terns.