This once-mighty river is where humans first developed agriculture, writing and the wheel. But now the lifeblood of the ancient world is under threat. Reaching the source of the Tigris is not an easy task. Where a dirt road ends, a small path leads over the shoulder of a jagged mountain whose peaks are gnawed like fingernails. The path becomes a goat track, treacherously narrow, winding around the hillside until it is halted by a tumble of springs. These form a torrential stream that disappears into a vast, arched tunnel.

https://www.bbc.com/travel/article/20230731-the-tigris-the-river-that-birthed-civilisation

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