Let $M$ be a Riemann surface and let us assume that it's geodesically complete. Let $W(t)$ be a Brownian motion on the surface and let $r>0$. Define the Wiener sausage as: $$ W_{r}(t):=\{ x\in M: d(x,W(s))\leq r\quad\text{for}\quad 0\leq s\leq t \}. $$ It is known that in $\mathbb{R}^{2}$ and for t sufficiently large $$ \mathbb{E}[\mathrm{vol}(W_{r}(t))]=\frac{2\pi t}{\log(t)}(1+o(1)). $$ Is there any analogue result for a general Riemann surface or at least the hyperbolic space? Thanks! --Gabriel