Night Light of Ruokolahti (South Karelia) from space (Finland) Src. Average luminocity for 10x10km area is 27.8347% and for 50x50km: 8.129%.
Square area 10x10 km:
 2.27%
 4.65%
 2.17%
 3.31%
 8.47%
 3.72%
 0%
 5.37%
 12.5%
 22.21%
 35.33%Square area 50x50 km:
 1.13%
 1.53%
 0.74%
 0.83%
 1.57%
 1.31%
 0.62%
 1.19%
 2.71%
 5.22%
 83.15%Clear (daylight) street map image can be seen on geolist.org.
Map coordinates:
61° 37' 9.7" North, 28° 7' 48.8" East
61° 16' 60" North, 28° 49' 60" East
60° 56' 37.2" North, 29° 32' 11.3" East
Some cities around Ruokolahti sort by population:
• Vyborg, RU
		64.2 km =39.9 mi, 
183°
• Lappeenranta
		42.6 km =26.5 mi, 
234°
• Imatra
		13.1 km =8.1 mi, 
199°
• Savonlinna
		65.3 km =40.6 mi, 
2°
• Svetogorsk, RU
		19.1 km =11.9 mi, 
175°
• Joutseno
		25.3 km =15.7 mi, 
223°
• Kamennogorsk, RU
		40 km =24.9 mi, 
156°
• Kerimäki
		73.7 km =45.8 mi, 
18°
Sources (retrieved 2019-11-25):
» Earth at Night: Flat Maps 2012, 2016