In Sri Lanka, Thailand, Cambodia, and Laos, you will definitely find a large focus on Jhana. Burmese systems seem to emphasize it less, but it's still there too. Anyone in the Ajahn Chah lineage or generally the Thai Forest Tradition will teach it, and they have wide reach throughout the Buddhist world.
Gain and loss, status and disgrace,
censure and praise, pleasure and pain:
these conditions among human beings are inconstant,
impermanent, subject to change.
Knowing this, the wise person, mindful,
ponders these changing conditions.
Desirable things don’t charm the mind,
undesirable ones bring no resistance.
His welcoming and rebelling are scattered,
gone to their end,
do not exist.
- Lokavipatti Sutta