Theia Mons is a large highland shield volcano on the planet Venus.
Located near the center of Beta Regio, a large region of recent volcanic uplift due to a currently active mantle plume,[3] Theia Mons is situated at the junction of three branches of Devana Chasma, an extensive rift system.
The south arm—which extends to Phoebe Regio—and the north arm collectively comprise Devana Chasma.
Volcanic flows from Theia Mons largely fill in these rift branches up to 300 kilometres (190 miles) from its central caldera.
[6][2] Theia Mons is surrounded by a large radial dike swarm and has four major groups of lava flows near its summit caldera.