Lock spits are lines of rocks, sometimes with a border survey post and a "blazed" tree to designate where a turn occurs in the Australian Capital Territories border. 100 years on these markers stand as a testament of the difficult work undertaken in rough country to establish the newly formed Federal Territory of Australia.


Today the survey posts have weathered away and the blaze trees have mostly met their end leaving only the rows of rocks as the only tangible evidence of the surveyors passing apart from the lines drawn on a map.

I have posts on the Federal survey marks (here)
and about the zig-zag border (here)


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