3 letters
AYR COE DEE DON TAY
4 letters
AVON CREE DOON EARN GALA ISLA NESS NITH SPEY
5 letters
ANNAN BRORA CLYDE FORTH LEVEN LOCHY NAVER ORRIN TORTH TWEED
6 letters
CARRON FARRAR KELVIN LIDDEL OYKELL TEVIOT THURSO TUMMEL
7 letters
DEVERON KIRKAIG
8 letters
FINDHORN TALISKER
10 letters
FORSS WATER (5,5)
11 letters
EYNORT RIVER (6,5)
12 letters
ARDTRECK BURN (8,4) HUISGILL BURN (8,4) SLEADALE BURN (8,4)
15 letters
BLACKADDER WATER (10,5)