Carmarthen & west Carmarthenshire · Waterway
Part of the Carmarthen, the Tywi & the Taf Estuary area guide
River Tywi
A practical local guide to habitats worth checking and the plants most likely to need careful identification.
Map of River Tywi
51.8600, -4.3000
The map shows the general area only. It does not mark confirmed invasive plant sites or individual properties.
About the area
River Tywi facts
River Tywi is a watercourse in the Swansea area, carrying water, seeds and soil downstream through the city and its valleys. It is part of the Carmarthen, the Tywi & the Taf Estuary area, within about 30 miles of Swansea.
- One of the longest rivers flowing wholly within Wales, at around 75 miles.
- It rises in the Cambrian Mountains and runs through Llandovery and Llandeilo to Carmarthen Bay.
- Its floodplain meadows and banks can carry balsam seed downstream.
- Drains part of the Swansea area, eventually reaching Swansea Bay and the Bristol Channel.
General local background, kept separate from the plant guidance below.
Local habitat
Where to look
Riverbanks, culverts, floodplain ground, wet ditches and bridge approaches are the main places where invasive or escaping garden plants can establish around River Tywi.
This is habitat guidance, not a claim that a particular property or site is infested.
