Lake Ram is a crater lake

Crater lake

A crater lake is a lake that forms in a volcanic crater or caldera, such as a maar; less commonly and with lower association to the term a lake may form in an impact crater caused by a meteorite. Sometimes lakes which form inside calderas are called caldera lakes, but often this distinction is not...

 (maar

Maar

A maar is a broad, low-relief volcanic crater that is caused by a phreatomagmatic eruption, an explosion caused by groundwater coming into contact with hot lava or magma. A maar characteristically fills with water to form a relatively shallow crater lake. The name comes from the local Moselle...

) in the northeastern Golan Heights, near Mount Hermon

Mount Hermon

Mount Hermon is a mountain cluster in the Anti-Lebanon mountain range. Its summit straddles the border between Syria and Lebanon and, at 2,814 m above sea level, is the highest point in Syria. On the top there is “Hermon Hotel”, in the buffer zone between Syria and Israeli-occupied...

. The only sources of the lake are rain water and an underground spring. The water does not leave the lake to any other body of water. The crater is a maar

Maar

A maar is a broad, low-relief volcanic crater that is caused by a phreatomagmatic eruption, an explosion caused by groundwater coming into contact with hot lava or magma. A maar characteristically fills with water to form a relatively shallow crater lake. The name comes from the local Moselle...

.

According to The Talmud

Talmud

The Talmud is a central text of mainstream Judaism. It takes the form of a record of rabbinic discussions pertaining to Jewish law, ethics, philosophy, customs and history....

, Birkat Ram is one of three underground springs, along with Hamat Gader

Hamat Gader

Hamat Gader is a site in the Yarmouk River valley, near the Sea of Galilee in the Golan Heights. The name means "hot springs of Gadara", referring to the several mineral springs with temperatures up to 50°C...

 in the southeastern Golan Heights and Hamat

Hamat

Hamat is a village in Lebanon. It is located 287 meters atop the historic cape of Theoprosopon. It is home to the historic shrine and monastery of Our Lady of Nourieh. The village is also home to the convent of Saint Elie, which overlooks the valley and the Joze River, or the River of Walnuts...

 in Tiberias, that opened up in The Flood of Noah

Noah

Noah was, according to the Hebrew Bible, the tenth and last of the antediluvian Patriarchs. The biblical story of Noah is contained in chapters 6–9 of the book of Genesis, where he saves his family and representatives of all animals from the flood by constructing an ark...

and didn't close up again after The Flood.