The National Park boundary look like it is the low water mark .. as far as I can see. Do you have other information? 

To restore the National Park boundary the following changesets may have been partially or fully reverted.. 
134119333, 134118581, 134118130, 134118022, 134101476, 134118022, 134108831, 134108066, 134107612, 134106999, 134106626, 134106019, 134104024, 134102957, 134102241

Please use changeset comments that reflect the actual changes... 