San Martín Tuxtla, Shield volcano in Veracruz, Mexico.

San Martín Tuxtla is a shield volcano in Veracruz rising 1,680 meters above sea level, with a summit crater 1 kilometer wide and 150 meters deep. The crater holds two pyroclastic cones that fed the 1793 eruption. Dense forest covers the slopes, and the broad base meets a band of trees.

San Martín Tuxtla erupted in 1664 from its southeast flank with a VEI 3 event, prompting residents to evacuate to the San Andrés valley. In 1793 a VEI 4 eruption from two summit pyroclastic cones produced widespread ashfall and lava flows down the northeast flank. A smaller VEI 2 eruption began in May 1794 and lasted two years.

The volcano's pre-Hispanic name was Titépetl, meaning "Hill of Fire" in Nahuatl, as recorded in Spanish sources; the English Wikipedia gives the variant Tiltépetl, glossed as "Black Mountain". The present name San Martín was given after the arrival of the conquistadors. The summit crater holds two pyroclastic cones, the vents of the 1793 eruption.

The forested slopes contain several hiking trails leading to viewpoints on the summit area. Access is on foot and requires steady effort due to the elevation and uneven ground.

Inside the main crater sit two distinct pyroclastic cones, giving the summit an unusual appearance. These inner structures are visible from the higher vantage points and show the volcano's complex geological past.