Provin Mountain is a very narrow traprock mountain ridge located in the Connecticut River Valley of Massachusetts. It is part of the Metacomet Ridge which extends from Long Island Sound near New Haven, Connecticut, north through the Connecticut River Valley of Massachusetts to the Vermont border. Provin Mountain is known for its scenic cliffs, unique microclimate ecosystems, and rare plant communities. It is traversed by the 114 mile (183 km) Metacomet-Monadnock Trail. Geography Provin Mountain rises steeply between above the river valleys of the Connecticut River and Westfield River below, with a high point of above sea level. It is roughly long but is not much more than wide at its widest point, although the steepness of the terrain makes the actual square mileage much larger. The Provin Mountain ridgeline extends from the Connecticut border (near the Suffield hamlet of Rising Corner) to the Westfield River on the tri-border of Westfield, West Springfield, and Agawam, Massachusetts; it lies within the towns of Southwick, Agawam, and Westfield. The Metacomet Ridge continues north from the Westfield River as East Mountain and continues south into Connecticut as West Suffield Mountain. The south side of the mountain drains into the Connecticut River, thence to Long Island Sound; the rest of the mountain drains into the Westfield River, thence to the Connecticut River. The mountain hosts several underground reservoirs which augment the water supply of municipal Springfield. Broadcast transmission Located at the summit of Provin Mountain is where the original studios and current transmitters for WWLP exist. WWLP first signed on from this location in March 1953. WWLP's studios remained there until 2000, when they were moved to Chicopee. The transmitter has remained there, as well as the current 475 foot (139 m) tower. WAQY, WHTX-LD, and WDMR-LD also maintain transmitters there. WUCS used to operate from this site as WPKX, prior to moving to Hartford in 2012. It is also home to numerous cellular, paging and two-way radio users. Geology and ecology Provin Mountain, like much of the Metacomet Ridge, is composed of basalt, also called traprock, a volcanic rock. The mountain formed near the end of the Triassic Period with the rifting apart of the North American continent from Africa and Eurasia. Lava welled up from the rift and solidified into sheets of strata hundreds of feet thick. Subsequent faulting and earthquake activity tilted the strata, creating the cliffs and ridgeline of Provin