the east. The capital and largest city is Lahore which was the capital of the wider Punjab region since 17th century. Other important cities include Faisalabad, Rawalpindi, Gujranwala, Sargodha, Multan, Sialkot, Bahawalpur, Gujrat, Sheikhupura, Jhelum and Sahiwal. The undivided Punjab region was home to six rivers, of which five flow through Pakistan's Punjab province. From west to east, the rivers are: the Indus, Jhelum, Chenab, Ravi and Sutlej. It is the nation's only province that touches every other province; it also surrounds the federal enclave of the national capital city at Islamabad. Topography Punjab's landscape consists mostly consists of fertile alluvial plains of the Indus River and its four major tributaries in Pakistan, the Jhelum, Chenab, Ravi, and Sutlej rivers which traverse Punjab north to south – the fifth of the "five waters" of Punjab, the Beas River, lies exclusively in the Indian state of Punjab. The landscape is amongst the most heavily irrigated on earth and canals can be found throughout the province. Punjab also includes several mountainous regions, including the Sulaiman Mountains in the southwest part of the province, the Margalla Hills in the north near Islamabad, and the Salt Range which divides the most northerly portion of Punjab, the Pothohar Plateau, from the rest of the province. Sparse deserts can be found in southern Punjab near the border with Rajasthan and near the Sulaiman Range. Punjab also contains part of the Thal and Cholistan deserts. In the South, Punjab's elevation reaches near the hill station of Fort Munro in Dera Ghazi Khan. Climate Most areas in Punjab experience extreme weather with foggy winters, often accompanied by rain. By mid-February the temperature begins to rise; springtime weather continues until mid-April, when the summer heat sets in. The onset of the southwest monsoon is anticipated to reach Punjab by May, but since the early 1970s, the weather pattern has been irregular. The spring monsoon has either skipped over the area or has caused it to rain so hard that floods have resulted. June and July are oppressively hot. Although official estimates rarely place the temperature above 46 °C, newspaper sources claim that it reaches 51 °C and regularly carry reports about people who have succumbed to the heat. Heat records were broken in Multan in June 1993, when the mercury was reported to have risen to 54 °C. In August the oppressive heat is punctuated by the rainy season,