One area, several names
The geography first, because the names confuse even guidebooks: Tierras Altas is a district of Chiriquí province whose capital is the town of Volcán; 'Volcán' is also the everyday name for the coffee area around that town; and Cerro Punta, famous for vegetables as much as coffee, is a separate town within the same district. They are overlapping places at different administrative levels — not competing regions — and farms here commonly give 'Volcán' or 'Tierras Altas' interchangeably as their address.
Which farms you can actually visit
Be honest with yourself about tourism infrastructure: this area has far fewer formal tour operations than Boquete, and several of its most famous farms (Finca Sophia, Ninety Plus's estates, Finca Los Cenizos) do not have publicly documented visitor programs that we could verify. Janson Coffee Farm in Volcán is the anchor producer of the area and the most likely starting point for a visit inquiry through its official channels. Contact farms directly and in advance — farm visits here are arrangements, not walk-in products.
Making the trip worthwhile
Pair the area with Cerro Punta's scenery and the La Amistad foothills, and time expectations around the harvest: January–April is when farms are processing and most likely to host visitors. If a specific farm is your goal, its profile on this site lists official contact channels — and its coffees, so you can taste what you'll be standing in. Volcán-based experiences get added to our tours page as operators document them.