This detailed map continues our coverage of the Rhondda Valley. It covers the northern part of Llwynypia, and coverage stretches from Llwynypia Colliery (at the foot of the map) northward to Tyntyla Isolation Hospital and north-east to St David's church, Tylorstown. Features include most of Llwynypia Colliery with railway lines, stretch of Taff Vale Rhondda-Fawr Branch, Llwynypia Homes, old levels and quarries, Ystrad Gas Works, western edge of Pont-y-gwaith (Deri Street), soap and candle works, tramways, Rhondda River etc. On the reverse we include directories of Llwynypia, Tylorstown and Pontygwaith in 1906.
The map links up with Glamorgan sheet 27.02 Gelli to the west and 27.07 Tonypandy to the south.