This is all rather interesting!

Having read through the thread I just 'knew' that the symbol for a waterfall on the 1:50k O.S. maps is a black line that cuts right across and beyond the width of the river or stream.

Indeed, it is what I had been taught in the Wolf Cubs at the tender age of eight!

A quick fumble through my store of by now ancient 1:50 maps tells me that this is exactly so. However, the mystery is that there is not a waterfall to be found on the key of any of my maps, no matter how old or new. Not on the map keys and not on any symbols keys on the interweb thingy either!

Generally, where this single black line cuts right through the watercourse it is always accompanied by the word 'Waterfall' or 'Waterfalls' or 'Falls' or some other tumbling like descriptor, always in a blue font. The waterfall you've picked out, Paul, does indeed have the blue descriptor 'Waterfall' adjacent to it.

:thinking_face:

Ah-ha! Yes you may be right.

I assumed the waterfall was to the left of the word 'waterfall' on the smaller tributary stream, but maybe the word is just put anywhere in the locality where there is a bit of space.

If you look a bit further along the burn there are some more black lines with the words 'falls' first on the left of the river and then on the right!

The line cutting across the tributary is in fact part of the O.S. symbol for a run of pylons. (They don't place the actual position of the pylons on the 1:50s, but do on the 1:25s.)

I think they place the descriptor where it has least effect on surrounding mapping.

:slightly_smiling_face: