It is bounded on the north-west by Ohio, from which it is separated by the Ohio river, on the north by Pennsylvania and Maryland, the Potomac river dividing it from the latter state; on the east and south-east by Pennsylvania, Maryland and Virginia, the boundary lines in the first two cases being meridians, in the last case a very irregular line following the crest of mountain ridges in places; and on the south-west by Virginia and Kentucky, the Big Sandy river separating it from the latter state.
Is the interior of the Northern Territory north of the 10th parallel; and the whole of the country, excepting the seaboard, lying between the meridians of 120° and 140°, and north of the 25th parallel, has a mean temperature in excess of 90° Fahr.
From the Springs the expedition went north-west and made a useful examination of the country lying between 119° and 115° meridians and between 26° and 28° S.
From the eastern extremity of the Tibetan mountains, between the 95th azd tooth meridians, high ranges extend from about 35°N.
British India comprises approximately the area between the 95th and 10th meridians, and between the Tibetan table-land and the Indian Ocean.
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