At least 12 inactive volcanoes are part of the San Quintin volcanic field, some of these are located inside protected natural areas. These volcanoes are part of the historical and geological heritage of the region.

More than 180,000 years ago, underwater volcanoes emerged and formed solidified lava islands. Concentrations of sediments and ashes later formed sandbars that gave shape to the bay.

1. Ceniza.
2. Riveroll.
3. Picacho Vizcaino.
4. Woodford complex (Callado Internacional and Monte San Quintin volcanoes).
5. Monte Kenton.
6. Monte Basu.
7. Isla San Martin.
8. Media Luna.
9. Sudoeste complex (Pescador and Sudoeste volcanoes).
10. Monte Mazo.

1) Ceniza

This volcano is in the middle of the Monte Ceniza Nature Reserve.

• Age: around 125,000 years
• Altitude: 180 meters (590.55 feet)
• Crater’s diameter: 350 meters
• Surface: 10.7 km2

2) Riveroll

• Age: more than 126,000 years
• Altitude: 220 meters (721.75 feet)
• Crater’s diameter: 380 meters
• Surface: 141 km2

3) Picacho Vizcaíno

• Age: about 22,000 years
• Altitude: 80 meters (262.46 feet)
• Crater’s diameter: 40 meters
• Surface: 1.97 km2

4) Woodford complex

Conformed by two volcanoes: Callado Internacional and Monte San Quintin.

• Age: between 84 and 135 thousand years
• Altitude: 103 meters (337.92 feet)
• Crater’s diameter: 310 meters
• Surface: 3.17 km2

5) Monte Kenton

• Age: between 126 and 145 thousand years
• Altitude: 240 meters (787.40 feet)
• Crater’s diameter: 160 meters
• Surface: 16.2 km2

6) Monte Basu

Also known as 771 volcano.

• Age: about 113,000 years
• Altitude: 210 meters (688.97 feet)
• Crater’s diameter: 320 meters
• Surface: 5.1 km2

7) Isla San Martín

• Age: about 31,000 years
• Altitude: 120 meters (393.70 feet)
• Crater’s diameter: 189.3 meters
• Surface: 2.71 km2

8) Media Luna

• Age: about 106,000 years
• Altitude: 108 meters (354.33 feet)
• Crater’s diameter: 320 meters
• Surface: 2.1 km2

9) Sudoeste complex

Formed by two volcanoes: Pescador and Sudoeste. Both are located inside the Punta Mazo Nature Reserve.

• Age: about 27,000 years
• Altitude: 100 meters (328.08 feet)
• Crater’s diameter: 340 meters
• Surface: 3.32 km2

10) Monte Mazo

This volcano is located inside the Punta Mazo Nature Reserve.

Monte Mazo and Sudoeste emerged as underwater islands that trapped sediments and sand deposits, this creating a sandbar that connects both volcanoes.

• Age: about 165 thousand years
• Altitude: 80 meters (262.46 feet)
• Crater’s diameter: 160 meters

References

Information obtained from the thesis “Geodiversidad costera de Bahía de San Quintín y zonas aledañas, Baja California, México” by Jorge Alberto Miros Gómez, from the Faculty of Marine Sciences of the Universidad Autónoma de Baja California (UABC).