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Ystrad Tywi (Welsh: [ˈəstrad ˈtəwi], Valley of the river Towy) is a region of southwest Wales situated on both banks of the River Towy (Welsh: Afon Tywi), it contained places such as Cedweli, Carnwyllion, Loughor, Llandeilo, and Gwyr (although this is disputed). Although Ystrad Tywi was never a kingdom itself, it was historically a valuable territory and was fought over by the various kings of Dyfed, Deheubarth, Seisyllwg, Gwynedd, Morgannwg and the Normans.