Ruins of Alnmouth Mortuary Chapel below Church Hill on the south side of the River Aln at Alnmouth on the Northumberland Coast. Les Bell April 5, 2019 2019, Alnmouth, Churches, Coast, Northumberland, River Aln, Rivers Ruins of Alnmouth Mortuary Chapel below Church Hill on the south side of the River Aln at Alnmouth on the Northumberland Coast.