Christchurch Harbour on a beautiful day in 4K.

Christchurch Harbour is a natural harbour in the county of Dorset, on the south coast of England named after the nearby town of Christchurch. Two rivers, the Avon and the Stour, flow into the Harbour at its northwest corner. The harbour is generally shallow and due to the tidal harmonics in the English Channel has a double high water on each tide. On the north side of the harbour, east of the Avon are Priory Marsh, and to the east of this Stanpit Marsh, a Local Nature Reserve. To the west side of the harbour are Wick Fields, the southern flank of the harbour being bounded by Hengistbury Head, a prominent coastal headland. The harbour flows into the Christchurch Bay and the English Channel through a narrow channel known locally as The Run which rests between Mudeford Quay and Mudeford Spit. Shallow-draught boats can enter from this channel and cruise up stream for 2 miles (3 km) choosing either the Avon or the Stour, the Stour leading up as far as Iford Bridge passing Christchurch Quay and Tuckton.

Christchurch Harbour Site of Special Scientific Interest (SSSI) is a 352-hectare (870-acre) site designated both for its biological and geological interest. It comprises the estuary of the Stour and Avon and the Hengistbury Head peninsula. The varied habitats include saltmarsh, wet meadows, grassland, heath, sand dune, woodland and scrub. The site is of great ornithological interest.

The harbour was formed around 7000 years ago when the sea level rose at the end of the last ice age. Previously the area which was many miles from the open sea was inhabited by Stone Age hunters. Archaeological finds dating from 12,500 year BP have been made on Hengistbury Head and Flints dating as much as 250,000 years BP have been found in the Bournemouth area.[3] The Bluestones used at Stonehenge may have been transported via the harbour and the River Avon (2550 BCE).[4] It is suggested that there may have been an ancient causeway usable at low water running from Double Dykes on the south shore to Tuttons Well located on the north shore near Stanpit village.