Lake numbers of Finland

The lake numbers of Finland consist of digits and dots. The very first numbers refer to the watershed of the main river (nn.xxx.xxx.xxx.xxx), the next digits indicate the second level waterway (xx.nnn.xxx.xxx.xxx) and the third digits the third level waterway (xx.xxx.xxx.nnn.xxx) and fourth digits the lake itself (xx.xxx.xxx.xxx.nnn).
Large main watersheds
There are 74 large main watersheds in Finland, each of them is larger than 200 square kilometres.
01
02
03
04 Vuoksi watershed
*Vuoksi
Examples
*Saimaa 04.112.1.001
05
06
07
08
09
10
11
12
13
14
15
16 Koskenkylänjoki watershed
*Koskenkylänjoki
16.001 Koskenkylänjoki lower course watershed
16.002 Koskenkyläjoki middle course watershed
*Syväjärvi 16.002.1.002
*Valkeapäänlampi 16.002.1.001
16.003 Artjärvi surroundings watershed
*Lammi 16.003.1.004
*Villikkalanjärvi 16.003.1.003
*Säyhtee 16.003.1.002
*Pyhäjärvi 16.003.1.001
16.004 Lanskinjoki watershed
16.005 Myrskylänjoki watershed
*Isojärvi 16.005.1.008
*Vähäjärvi 16.005.1.007
*Pöyrysjärvi 16.005.1.006
*Muttilanjärvi 16.005.1.005
*Siippo 16.005.1.004
*Sopajärvi 16.005.1.003
*Kirkkojärvi 16.005.1.002
*Sulkavanjärvi 16.005.1.001
16.006 Haltionjoki - Köylinjoki watershed
16.007 Litinjoki watershed
16.008 Ålhusbäcken watershed
Examples
*Syväjärvi 16.002.1.002
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71 Paatsjoki watershed
*Paatsjoki large main river way
Examples
*Syväjärvi, classification code 71.111.1.326
*Syväjärvi, classification code 71.119.1.014
*Syväjärvi, classification code 71.622.1.012
*Syväjärvi, classification code 71.913.1.008
72
73
74
Minor watersheds on the coasts and border areas
81
82
83
84
85
86
Maritime watersheds
91
92
92
93
94
95
96
97
98
99

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