Related Clues:

• Water barrier, quite mad
• A mad kind of mum
• A mad sort of mum
• Triangular patch of land at mouth of river
• The fourth Greek letter found at river's mouth
• Area where a river divides before entering the sea
• The Greek D (5)
• Mad as an animal mum
• Fourth letter of the Greek alphabet
• Barrier to contain a flow of water
• Barrier to contain water
• Female parent of livestock
• She will hold things up enough to make you turn dotty
• All that water behind her is enough to make her turn insane
• At her age there might be some harm in being like that