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Let $n\geq 2$ and $1\leq q<p<\fz$. We prove that if $\Omega\subset\mathbbR^n$ is a Sobolev $(p, q)$-extension domain, with additional capacitoryrestrictions on boundary in the case $q\leq n-1$, $n>2$, then$|\partial\Omega|=0$. In the case $1\leq q<n-1$, we give an example of aSobolev $(p,q)$-extension domain with $|\partial\Omega|>0$.

The volume of the boundary of a Sobolev $(p,q)$-extension domain