Chelsea Creek, shown on federal maps as the
Chelsea River, is a waterway that runs along the shore of
Chelsea, Massachusetts and separates that community from the cities of
Boston and
Revere as well as feeding part of the current
Belle Isle Marsh Reservation that separates Boston from Revere. The creek starts as Mill Creek at a former pond at the intersection of
Revere Beach Parkway (
Massachusetts Route 16) and
U.S. Route 1, now a shopping center. Mill Creek meanders east for 0.5 miles, then takes a sharp turn south, becoming Chelsea Creek, and widens significantly as it runs between Chelsea and the neighborhood of
East Boston. In that area the waterway is used by
oil tankers to transport fuel to adjacent oil tanks. The creek then turns southwest and runs into the
Mystic River shortly before it empties into
Boston Harbor.