〜とはいうものの
having said that, although (it's true that)
Plain form / Noun + とはいうものの
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とはいうものの admits something is true in name or in principle, then adds a reality that doesn't match: 春とはいうものの、まだ寒い日が続く, "it may be spring, but the cold days go on".
It's built from と言う ("say") plus ものの (N2, "although"), so it's literally "although one says that…". The second half is usually a gap between the label and reality, or a lingering doubt.
It's very close to とはいえ (N2) and とはいっても. とはいうものの is a little more formal and reflective.
Compare というより (N3), "rather than", which corrects a description instead of conceding it.
Examples
春とはいうものの、まだ寒い日が続く。
It may be spring, but the cold days go on.
自分で決めたとはいうものの、不安もある。
Although it was my own decision, I do have worries.
日本語を勉強しているとはいうものの、まだ簡単な会話しかできない。
I say I'm studying Japanese, but I can still only manage simple conversations.
夏休みとはいうものの、毎日部活がある。
It's the summer holidays, supposedly, but I have club activities every day.
安いとはいうものの、やはり買うのは迷う。
Cheap as it is, I'm still in two minds about buying it.