Black
Black tea is fully oxidized: the leaf is allowed to oxidize completely before drying, transforming the fresh green into amber liquor and developing the malty, fruity, and sometimes astringent character that defines the category. Regional variation is dramatic. Chinese hong cha from Keemun or Yunnan sits in a different world from Darjeeling's floral first-flush muscatel, Assam's thick malty strength, or Sri Lanka's clean bright Ceylon. Taiwan, Korea, Japan, and Africa have each built smaller but distinctive black-tea traditions in the last few decades. Full oxidation makes the chemistry of black tea stable and forgiving, which is part of why it became the world's most widely traded leaf.

Brewing note
Most black teas brew well at 90-100°C. Darjeeling first-flush and delicate Taiwan blacks are exceptions that benefit from slightly lower temperatures (85-90°C) to preserve their floral character. Western-style single infusions run 3-5 minutes; gongfu-style brewing with short successive steeps reveals more complexity from quality loose-leaf.
Families
China hong cha
Chinese black tea (hong cha) is the classical tradition from which the rest of the world's black-tea culture derives, and it reads very differently from its descendants. Keemun carries a distinctive wine-and-floral note that no other black tea produces; Dianhong from Yunnan is golden-tipped and malty in a way that resembles but outclasses cheap Assam; Jin Jun Mei is bud-only and expensive enough to separate it from most comparisons. If you are tracking hong cha to contrast it with India & Himalayan or Africa, expect less astringency and more aromatic complexity across the range.
Dianhong (Yunnan), Keemun, Lapsang Souchong …
India & Himalayan
The family that shaped how most of the world understands black tea: Assam's full-bodied malt built the breakfast-tea market; Darjeeling's delicate first-flush muscatel sits at the opposite end of Indian black tea and is frequently misrepresented; Nilgiri produces a bright, clean brisk style suited to iced tea. Nepal's high-altitude orthodox teas now compete directly with Darjeeling in character. CTC and orthodox processing from the same garden produce categorically different cups, so noting that variable matters for logging.
Assam, Assam CTC, Darjeeling …
Sri Lanka
Ceylon blacks are named by district and elevation, and the differences are real. Nuwara Eliya's high-grown character is floral, pale-liquored, and relatively delicate; Uva's seasonal brisk astringency makes it the classic iced-tea and blending base; Dimbula sits softer and fuller in the middle. Sri Lanka does not produce the regional complexity of India or the aromatic range of Chinese hong cha, but its consistency and cleanliness have made it the backbone of commercial blending and a reliable single-origin option for straightforward Western brewing.
Ceylon, Ceylon Uva, Ceylon Dimbula …
Blends & flavored
Blended and flavored blacks are the world's most-consumed tea category by volume, and they range from industrially uniform to seriously crafted. Earl Grey is bergamot oil over a neutral base (the quality of both matters). Irish Breakfast is typically a heavy Assam-led blend built for milk. English Breakfast varies by producer. Masala Chai is spiced black tea, either pre-blended or built at brew time. These do not require single-origin sourcing knowledge, but the base tea and the scenting or blending quality are still worth tracking for your own reference.
Earl Grey, English Breakfast, Irish Breakfast …
Taiwan
Taiwan's black teas are defined by cultivar character more than any other black-tea family. Ruby 18 (Hong Yu) carries a signature cinnamon-menthol note that makes it immediately identifiable and unlike any Indian or Chinese black; it was bred from a wild Taiwanese assamica crossed with a Burmese assamica. The broader Hong Cha category covers other local-cultivar blacks that are typically lighter and more aromatic than Himalayan-tradition blacks. For a drinker familiar with Darjeeling or Assam, Taiwanese blacks are a genuinely different experience.
Taiwan Ruby #18 (Hong Yu), Taiwan Black Tea (Hong Cha)
Korea & Japan
East Asian black teas made outside China's hong cha tradition, and lighter for it. Japanese Wakocha is typically made from Yabukita or other Japanese cultivars, with a mild, often floral and slightly sweet character that reads nothing like Assam or Keemun. Korean styles span a wider range: Hongcha is fully oxidized and clean; Balhyocha covers a range of partially oxidized Korean teas; Hwangcha is the lighter end of that range, with a yellow-amber liquor from low oxidation. These are young traditions relative to Chinese hong cha, still finding their identities, with small but genuine followings among collectors who want origin diversity outside the classical canon.
Korean Black (Hongcha), Balhyocha (Korean Oxidized), Hwangcha (Korean Oxidized “Yellow”) …
Africa
East African blacks, primarily from Kenya and Rwanda, are high-grown, sunshine-driven, and typically bold: bright liquor, strong color, clean brisk character, and often a fruity note that distinguishes them from Assam or Ceylon. Kenya produces largely CTC for the mass market but has a growing orthodox and specialty sector; Rwanda's specialty blacks have attracted attention for their floral-fruity profile. These are not the nuanced fragrance teas of Chinese hong cha or Darjeeling, but as clean, bold, well-sourced single-origins they are more than blending filler.
Kenyan Black Tea, Rwandan Black Tea
Southeast Asia
Vietnamese black teas from ancient wild trees in the northern highlands, grown at elevation from assamica-related material that predates plantation cultivation in the region. Shan Tuyet Black from Da Bac and Ha Giang shows a broad-leafed, often smoky and mineral character with more body and wildness than lowland-grown blacks. These are niche collector teas; they sit outside both the Chinese hong cha canon and the Indian-tradition mold, and the wild-tree provenance gives them a terroir specificity that lowland Vietnamese material lacks.
Shan Tuyet Black (Vietnam), Vietnamese Wild Assamica