R Glen Jenkin - that's not a term I am familiar with from a registration perspective re land/waterways in England & Wales.
I would recommend seeking legal advice/assistance as land/waterways and boundaries can be a complex area of the law and such matters may not be registerable in England & Wales as a result
Whilst our PG 40 supplement includes guidance on certain legal presumptions re land/waterways as the term is not one we use wider legal guidance should be sought re the 'land' you are referring to -
HM Land Registry plans: boundaries (PG40s3) - GOV.UK