Continuing to descend, we come to the pool filled with water from a pipe. This is Ein Siah, a spring that provided water for Central Carmel neighbourhoods in the 1930s. Above us is a slope dotted with red and yellow. Those are euphorbia dendroides (halabolbei hasiah), a rare plant in Israel only on the western Carmel.
Nahal Siah gets its name in Hebrew and Arabic from the frequent hikers. In both languages, it is derived from words meaning “tour” or “hike.” The walk begins on Lotus Street. Descend to the right near the black trail mark, first on the asphalt road and then down the stairs, into the heart of the gully.