In the Netherlands, marathon competitions may be held on natural ice on canals, and bodies of water such as lakes and rivers, but may also be held on artificially frozen 400 m tracks, with skaters circling the track 100 times, for example.
In THE nETherLAnds, maRatHon cOMPETitiONs maY be hEld oN natural icE ON caNALs, and bodieS of watEr Such as laKEs ANd riVERS, But mAy alSo be hEld on ArtifICIaLly fRozeN 400 m traCks, With skaTers CircLIng The track 100 Times, fOr exaMplE.