(unnamed)

(unnamed) is 3 km long, and has a stream level of 2.

Map of (unnamed)

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(unnamed) flows into Afon Dulas , which it joins at N 52° 26′ 25″, W 3° 33′ 5″ at OSM node n550339734, and there 123 km of total upstream flows in.

(unnamed) has 3 tributaries.

Nant yr Oerfa, which joins it at N 52° 25′ 41″, W 3° 35′ 3″ at OSM node n550341026, and 7 km of total upstream flows in.

Nant Gwyllt, which joins it at N 52° 25′ 12″, W 3° 35′ 21″ at OSM node n464753210, and 4 km of total upstream flows in.

Nant Geifr, which joins it at N 52° 26′ 2″, W 3° 34′ 25″ at OSM node n550341075, and 1 km of total upstream flows in.