Is Angel Island Off the U.S. East Coast?

No. Angel Island is in San Francisco Bay, off the coast of San Francisco, California—on the West Coast.

It is the largest natural island in the bay, now a state park (Angel Island State Park) with immigration station history (Ellis Island of the West), hiking, biking, and 360° bay views. Ferries run from Tiburon and San Francisco (Pier 41).

East Coast islands of similar historic note include Ellis Island (NY/NJ) and Fort Sumter (SC).