Woogill Tarn is, along with near neighbour Coverdale Tarn, one of two tarns near the summit of Great Haw on the Nidderdale / Coverdale watershed.
Whilst Coverdale Tarn lies just within the boundary of the Yorkshire Dales National Park, Woogill Tarn straddles the boundary between the national park and the Nidderdale AONB. According to the OS Explorer map Woogill Tarn has two outflows, one heading north into Coverdale and one heading south into Woo Gill. Presumably it is this connection with Woo Gill that resulted in the tarn receiving its name.
Both tarns are slightly off the beaten path and some heather bashing may be required to reach them. If unsure which one is which, the easy way to identify Woogill Tarn is that it is the one dotted with numerous small islands of heather and reeds.