In the rodent brain, the 1 cm shank of the Neuropixels probe distributes 1,000 sites across multiple brain regions. These sites record from hundreds of neurons distributed across brain regions
For instance, two Neuropixels probes inserted simultaneously can record from over 500 neurons in 5 regions of the mouse brain (Jun, Steinmetz, Siegle, Denman, Bauza et al, Nature 2017).

These preliminary data are publicly available.