The pattern
Oolong shows the widest regional spread in tea, and most of the spread sits in method rather than soil.
The northern core, Wuyi, roasts its leaf until it is dark, and the cup tastes of stone and char.
Anxi keeps Tieguanyin green, rolls it into pellets, and the cup smells of orchid and cream.
Fenghuang in Guangdong works single bushes separately, and each named tree carries its own perfume.
Taiwan’s high mountain gardens push the leaf lighter still, and the result is sweet and thin bodied.
Four regions, four drinkable styles, and knowing one of them tells you almost nothing about the others.
The category name is close to useless as a description, which is unusual and worth saying plainly.
Oxidation runs from about 20 percent to about 70 percent depending on where the tea was made.
That range is wider than the gap between some whole categories.
A Wuyi tea and an Anxi tea share a name and a country, and very little after that.
Learn the pattern as four separate styles rather than as one style with local variations.
What drives it
Method comes first in oolong, and the reason is historical rather than agricultural.
Roasting began in Wuyi because leaf had to survive a damp mountain winter and a long journey north.
The green pellet came afterwards, once machines could roll cloth wrapped leaf in quantity.
Cultivar comes second, and each region holds bushes the others do not grow.
Wuyi runs on small leaf types with local names, and few of them are planted outside the area.
Anxi is tied to Tieguanyin and its relatives, which behave differently under the same hands.
Climate comes third, and it works through elevation more than through latitude.
Taiwan’s gardens sit above 1,000 m, where cool nights slow the growth and thicken the leaf.
Trade decided what survived, since Wuyi went north overland and Anxi went out by sea.
Fame is not the same as quality, and several excellent districts stayed obscure because no port handled them.
Method, cultivar, climate and trade, roughly in that order, explain what ends up in the cup.
Learning the map
Build the map by contrast rather than by reading, because contrast sticks and descriptions do not.
Start with Wuyi against Anxi, which is the widest gap in the category and the easiest one to taste.
One is dark and roasted, the other green and floral, and nobody confuses them twice.
Fenghuang comes next, since a single bush dancong sits between the two and smells unlike either.
A Taiwanese high mountain tea finishes the set, and it is the lightest and most delicate of the four.
Four sessions is enough to place most of the oolong you will ever be offered.
Inside Wuyi, learn roast levels before boundaries, since a lightly roasted one tastes closer to Anxi than to a dark one.
Inside Anxi, learn the gap between the modern green style and the older roasted one.
Inside Taiwan, learn elevation before district, because the altitude claim is what sets the price.
Boundaries matter last, and only when you are paying for them specifically.
That order saves money, since the expensive distinctions are always the narrowest ones.
Tasting across regions
Set up four small vessels side by side, and use the same water and the same timing for all of them.
Put 5 grams of leaf in a 100 ml gaiwan and pour the water at about 95 °C.
Steep the first infusion for 30 seconds and add time as the leaf opens.
Smell the wet leaf before drinking, since aroma separates these regions faster than taste does.
Roast arrives as char and stone, flowers arrive as orchid, and elevation arrives as a thick sweetness.
Drink through to the 4th infusion, where the roast has faded and the base leaf is doing the work.
By then a Wuyi tea has gone sweet and an Anxi tea has gone thin, and the difference is impossible to miss.
Inspect the spent leaf as well, because Wuyi leaf comes out dark and broken while Anxi pellets open into whole leaves.
Write down what you liked rather than what you were told, and buy on your own notes.
Any region you cannot taste is a region you should not be paying extra for.
Repeat the session about once a year, since your own reference points drift more than the tea does.