Olonets Governorate
Olonets Governorate was an administrative-territorial unit of the Russian Empire, extending from Lake Ladoga almost to the White Sea, bounded west by Finland, north and east by Arkhangelsk and Vologda, and south by Novgorod and Saint Petersburg. The area was 57,422 km2, of which 6,794 km2 were covered by lakes.
Geology
Its north-western portion belonged orographically and geologically to the Finland region; it is thickly dotted with hills reaching 1,000 ft. in altitude, and diversified by numberless smaller ridges and hollows running from northwest to south-east. The rest of the governorate was a flat plateau sloping towards the marshy lowlands of the south. The geological structure was very varied. Granites, syenites, and diorites, covered with Laurentian metamorphic slates, occurred extensively in the north-west. Near Lake Onega they were overlain with Devonian sandstones and limestones, yielding marble and sandstone for building; to the south of that lake carboniferous limestones and clays made their appearance. The whole was sheeted with boulder-clay, the bottom moraine of the great ice-sheet of the last glacial period. The entire region bears traces of glaciation, either in the shape of scratchings and elongated grooves on the rocks, or of eskers running parallel to the glacial striations.Hydrology
Many lakes occupied the depressions, while a great many more had left evidences of their existence in the extensive marshes. Lake Onega covers 3,764 m2, and reaches a depth of 400 ft. Lakes Zeg, Vygozero, Lacha, Loksha, Tulos, and Vodlozero cover from 140 to 480 m2 each, and their crustacean fauna indicates a former connection with the Arctic Ocean. The south-eastern part of Lake Ladoga falls also within the government of Olonets. The rivers drain to the Baltic Sea and White Sea basins. To the former system belong Lakes Ladoga and Onega, which are connected by the Svir River and receive numerous streams; of these the Vytegra, which communicates with the Mariinsk canal-system, and the Oyat, an affluent of Lake Ladoga, are important for navigation.Climate and Fauna
Large quantities of timber, firewood, stone, metal and flour were annually shipped on waters belonging to this governorate. The Onega River, which has its source in the south-east of the governorate and flows into the White Sea, is of minor importance.Sixty-three percent of the area of Olonets was occupied by forests; those of the Crown, maintained for shipbuilding purposes, extended to more than 800,000 acres.
The climate is harsh and moist, the average yearly temperature at Petrozavodsk being 33.6 °F. 12.0 °F in January, 57.4 °F in July; but the thermometer rarely falls below 30 °F.