Red Triangle

San Francisco, CA 94101

Each year, in the late summer, a region known as the Red Triangle bustles with marine mammal activity. Lying between San Francisco and Monterey, the Red Triangle includes beaches where elephant seals go to molt, and offshore sites where great whites feed on unwary prey. When not prowling the Red Triangle, great white sharks search the kelp forest for sea lions, or roam the open ocean. Their migration is predictable. Each year they turn up at the same place at the same time, occasionally crossing paths with humans who still swim and surf in these dangerous waters.

Experts have spent decades studying these legendary killing machines of the seas and the animals that make up their food chain, including elephant seals, killer whales, sea otters, and sea lions. Their research reveals several surprising facts. Great whites are not always solitary hunters, they occasionally hunt and feed together. Once thought a coastal species, great whites do swim in the mid-Pacific, at depths matching those of female seals. Sea otters were previously considered immune to attacks by great whites. In fact, they are often their victims.

Images provided by AmericanTowns.com, Ticketmaster
Please use "Flag This Place" to alert us about content that is inappropriate or needs immediate attention. Nothing you submit will be shared with other site visitors.

Upcoming AARP Events

View All AARP Events »


Find information about getting a COVID-19 vaccine in your state. CDC information is available at cdc.gov/coronavirus; additional AARP information and resources are at aarp.org/coronavirus. En español, visite aarp.org/elcoronavirus.

AARP Member Card

Join or Renew Today

JOIN FOR JUST $16 A YEAR

  • Immediate access to your member benefits
  • Discounts on travel and everyday savings
  • Subscription to the award-winning AARP The Magazine
  • An ally on the issues that matter most to you in San Francisco
  • Free membership for your spouse or partner
JOIN NOW