seasonal waterhole in nahal karkash canyon near sde boker in israel

arid backroads beaten bedrock blue boker boqer cache canyon cliffs climate desert desertscape dramatic dry ecosystem ecotourism environment forbidding geological geology highlands hiking israel karkash landscape limestone nahal natral natural nature negev phenomenon rain rainwater rocky rugged scenic sde seasonal sky slab southern sparse steep stream sunny terrain touring track trekking valley vegetation vertical wadi water waterhole winter zin