stretch — to draw out or extend (oneself, a body, limbs, wings, etc.) to the full length or extent (often followed by out): to stretch oneself out on the ground.
swathes — to wrap, bind, or swaddle with bands of some material; wrap up closely or fully.
masses — the celebration of the Eucharist. Compare High Mass, Low Mass.
lots — a river in S France, flowing W to the Garonne. 300 miles (480 km) long.