TARTUS, Syria — Loyalists who support the government of President Bashar Assad are flocking to the Mediterranean port of Tartus, creating an overflowing boomtown far removed from the tangled, scorched rubble that now mars most Syrian cities.

There are no shellings or air raids to interrupt the daily calm. Families pack the cafes lining the town’s seaside ­corniche, usually abandoned in December to the salty winter winds. The real estate market is brisk. A small Russian naval base provides at least the impres­sion that salvation, if needed, is near.