Hmm, did it where I live, on the side of a hill which goes to the brook at the bottom of the hill into a named river which starts about a mile away, that river

Hmm, did it where I live, on the side of a hill which goes to the brook at the bottom of the hill into a named river which starts about a mile away, that river flows into the Trent and out into the North Sea. The site instead thinks water flows a completely different direction eventually ending up in the River Severn That said it seems to start the trace from about 2 miles north from where I clicked, and that looks right based on that starting point. Didn't realise how close I was to the East-West watershed of the UK!