Islay Hill

Islay Hill is a volcanic cone, and is the southernmost of the nine volcanic mountains and hills that make up the Nine Sisters, located in the San Luis Obispo County of central California.

Islay Hill
Viewed from the south. Righetti Hill (formerly Mine Hill), a minor peak, is seen to the left.
Highest point
Elevation	783+ ft (239+ m) NAVD 88[1]
Coordinates	35°14′44″N 120°37′21″W[2]
Geography
Location	San Luis Obispo County, California, U.S.
Parent range	Santa Lucia Range
Topo map	Arroyo Grande NE
Geology
Rock age	20 million years
Mountain type	Volcanic plug

This chain of extinct, but possibly dormant volcanoes, the eight others volcanic plugs, stretches from Morro Bay southeast to Islay Hill, which is on the southeast side of San Luis Obispo (city).